DP Chemistry (last assessment 2024)
Question 21M.2.hl.TZ2.2c
| Date | May 2021 | Marks available | [Maximum mark: 4] | Reference code | 21M.2.hl.TZ2.2c |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Deduce | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 4]
21M.2.hl.TZ2.2c
The properties of elements can be predicted from their position in the periodic table.
(c)
Deduce the Lewis (electron dot) structure and molecular geometry of sulfur tetrafluoride, SF4, and sulfur dichloride, SCl2.
[4]
Markscheme
SF4/SCl2 structure does not have to be 3-D for mark.
Penalize missing lone pairs of electrons on halogens once only.
Accept any combination of dots, lines or crosses for bonds/lone pairs.
Accept “non-linear” for SCl2 molecular geometry.
Award [1] for two correct electron domain geometries, e.g. trigonal bipyramidal for SF4 and tetrahedral for SCl2.